SOLUTION: A plane takes 2 hours and 45 min to cover the distance between two airports. If it travels 20 km/h slower than it takes 3 hours. find the speed of the plane. Also, find distance be

Question 821201: A plane takes 2 hours and 45 min to cover the distance between two airports. If it travels 20 km/h slower than it takes 3 hours. find the speed of the plane. Also, find distance between the two airports.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
D=rt
Distance is same
let x be the speed
D=2 3/4 *x
==11/4 x
speed x-20
d= (x-20)*3
equate both
11/4 x = (x-20)*3
11x= 12(x-20)
11x=12x-240
12x=11x=240
x= 240
speed = 240 kph
d=rt
d= 11/4 * 240
d=11*60
=660 km
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